Explanation

(a) *Arcuate
     * Bird's foot

(b)* Active vertical and lateral erosion in upper course of a river to provide sediments
    * Following river to carry large load of sediments
    * tideless coast
    * Shallow sea to prevent the disappearance of sediments

(c) * Feature of the lower course of a river 
     * Fan shaped at river mouth for arcuate delta
     *A river depositional feature

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